btw. You always seem to report these just after the actual release. Why didn't you test the RCs..?

[2009-12-18 05:10 UTC] Bjorn dot Wiberg at its dot uu dot se

Sorry about that -- I compiled and packaged 5.3.0 on AIX a couple of months ago but was not aware of the 5.3.1 release until yesterday (when visiting the download pages). We're planning to migrate to 5.3.x the upcoming spring.
At the moment we're running 5.2.11, which is working fine, so we did not anticipate any problems with 5.2.12 as it is a minor upgrade.

[2009-12-18 05:13 UTC] Bjorn dot Wiberg at its dot uu dot se

As for 5.3.0, we actually did do the testing with the beta/release candidate versions prior to the release (and noticed and filed some bug reports). But for minor upgrades we haven't been hit very hard with severe bugs so far so usually stick with the releases (which often work fine).